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An increasing number of lecture recordings are available to complement face-to face and the more conventional content-based e-learning approaches. These recordings provide additional channels for remote students and time-independent access to the lectures. Many universities offer even complete series of recordings of hundreds of courses which are available for public access and this service provides added value for users outside the university. These lecture recordings show the use of a great variety of media or modalities (Such as video, audio, lecture media, presentation behavior) and formats. Insofar, none of the existing systems and services has sufficient retrieval functionality or support appropriate interfaces to enable searching for lecture recordings over several repositories.
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